Screen displays the normal tabs for "Mail" but the page will not open
I click on the mail icon. The upper left of screen displays the normal tabs for "Mail". However, the page will not open.
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iMac 21.5″, macOS 10.15
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Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode?
Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.